By convention, outward force is defined as positive, and inward force is defined as negative. The solution to the equation is known as the net filtration or net fluid movement (Jv). If positive, fluid will tend to leave the capillary (filtration). If negative, fluid will tend to enter the capillary (absorption).

Starlings forces are the major determinants in the development of edema.

According to Starling’s equation, the movement of fluid depends on six variables: